# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html
import random
from scrapy import signals
from fake_useragent import UserAgent
# useful for handling different item types with a single interface
from itemadapter import ItemAdapter
from scrapy.core.downloader.handlers.http11 import TunnelError

from util.proxies import get_proxies,get_proxies_poll

class TutorialSpiderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        print("cccccccccccccccccc")
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, or item objects.
        print("ddddddddddddddd")
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request or item objects.
        pass

    async def process_start(self, start):
        # Called with an async iterator over the spider start() method or the
        # maching method of an earlier spider middleware.
        async for item_or_request in start:
            yield item_or_request

    def spider_opened(self, spider):
        spider.logger.info("Spider opened: %s" % spider.name)


class TutorialDownloaderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        print("aaaaaaaaaaaaa")
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        print("bbbbbbbbbbbbbb")
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info("Spider opened: %s" % spider.name)

class TutorialUserAgentMiddleware:
    def process_request(self, request, spider):
        request.headers["User-Agent"] = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/000000000 Safari/537.36 Edg/114.0.1823.51"


ua = UserAgent()
class RandomUserAgentMiddleware:
    def process_request(self, request, spider):
        print(f"处理下载请求11")
        request.headers['User-Agent'] = ua.random
    def process_response(self, request, response, spider):
        print(f"处理下载响应22")
        return response


user_cookies = ["ahgisjgke;ogr1","gabehginujiegojeg2", "ahljegioagneg3", "ehlgjaiegoeogkg4", "ehjgojejgegg5"]
class RandomUserCookieMiddleware:
    def process_request(self, request, spider):
        print(f"处理下载请求111")
        print(request.headers, "====")
        request.headers['cookie'] = f"sessionid={random.choice(user_cookies)}"
        print(request.headers, "====")

    def process_response(self, request, response, spider):
        print(f"处理下载响应222")
        return response














class ProxiesMiddleware:
    @classmethod
    def from_crawler(cls, crawler):
        s = cls()
        s.settings = crawler.settings
        return s

    def process_request(self, request, spider):
        request.meta['proxy'] = random.choice(self.settings['PROXIES'])

    def process_response(self, request, response, spider):
        return response



class ProxiesPoolMiddleware:

    @classmethod
    def from_crawler(cls, crawler):
        s = cls()
        # s.proxy_poll = get_proxy_poll(1)

        s.proxy_poll = [

        ]

        return s

    def process_request(self, request, spider):
        # request.meta['proxy'] = random.choice(self.proxy_poll)['http']
        # request.meta['proxy'] = f'http://d4193409972:njyzbgtb@58.19.54.135:27105/'

        if len(self.proxy_poll) == 0:
            self.proxy_poll.append(get_proxies())
        # 从池子中随机 IP字典{http:'', https:''}
        ip = random.choice(self.proxy_poll)
        print(f"使用代理 {ip['http']} 发起请求")
        request.meta['proxy'] = ip['http']
        request.meta['ip'] = ip


    def process_response(self, request, response, spider):
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        if isinstance(exception, TunnelError):
            ip = request.meta['ip']
            print(type(exception), "代理出现异常", ip['http'])

            if ip in self.proxy_poll:
                self.proxy_poll.remove(ip)
                self.proxy_poll.append(get_proxies())

            if len(self.proxy_poll) == 0:
                self.proxy_poll.append(get_proxies())

            ip = random.choice(self.proxy_poll)
            request.meta['proxy'] = ip['http']
            request.meta['ip'] = ip
            print(f"发起请求，。。。。。。。。。。。。。。。。")
            return request



class TunnelProxiesMiddleware:



    def process_request(self, request, spider):
        # 隧道域名:端口号
        tunnel = "r475.kdltps.com:15818"

        # 用户名密码方式
        username = "t16308830505218"
        password = "c7c43xma"
        request.meta['proxy'] = "http://%(user)s:%(pwd)s@%(proxy)s/" % {"user": username, "pwd": password, "proxy": tunnel}


    def process_response(self, request, response, spider):
        return response






